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首页> 外文期刊>Applied Mechanics and Engineering >FEM ANALYSES OF STEEL MEMBERS AND CONNECTIONS CONSIDERING DAMAGE CUMULATION EFFECTS UNDER CYCLIC LOADING
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FEM ANALYSES OF STEEL MEMBERS AND CONNECTIONS CONSIDERING DAMAGE CUMULATION EFFECTS UNDER CYCLIC LOADING

机译：考虑循环荷载作用下损伤累积效应的钢构件和连接件的有限元分析

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摘要

Due to the expansion of micro defects, the mechanical properties of structural steel, such as yielding strength, Young's modulus and hardening coefficient will deteriorate under cyclic loadings, and low cycles fatigue failure may take place. Based on continuum damage theory and experimental results, a cumulative damage mechanics model using effective plastic strain is suggested. A general procedure of FEM analysis considering damage cumulation effects is presented and damage crack criterion is proposed as well. Cantilever members subjected to cyclic loading are numerically simulated with FEM program which took the damage cumulation into consideration. The analytical results agree very well with the experiments, and hence, the proposed cumulative damage mechanics model is demonstrated to be accurate enough to simulate the behavior of steel structures under seismic loading. Since the model proposed in the paper can also calculate the cumulation of the damage, it means that the method can also be adopted to access the seismic behavior of steel structures under earthquakes.
机译：由于微缺陷的扩展，结构钢的机械性能（如屈服强度，杨氏模量和硬化系数）在循环载荷下会变差，并且可能发生低循环疲劳破坏。基于连续损伤理论和实验结果，提出了利用有效塑性应变的累积损伤力学模型。提出了考虑损伤累积效应的有限元分析的一般程序，并提出了损伤裂纹判据。考虑了损伤累积的有限元程序，对承受周期性载荷的悬臂构件进行了数值模拟。分析结果与实验非常吻合，因此，所提出的累积损伤力学模型被证明足够准确，可以模拟钢结构在地震荷载下的行为。由于本文提出的模型还可以计算损伤的累积量，这意味着也可以采用该方法来访问地震作用下钢结构的地震行为。

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